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J. WAHLBEHG.

MICRONIETER.

APPLICATION FILED ocT.29.1913.

Patented Ang. 29, 1916.

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J. VVAHLBERG.

MICROIVIETER.

APPLICATION FILED ocT.29,1913.

Patented Aug. 29, 1916.

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JOI-IN WAHLBERG, OF NEW YORK, N. Y.

MICROMETER.

Specification of Letters Patent.

Patented Aug. 29, 1916.

Application led October 29, 1913. Serial No. 798,008.

T all whom t may concern Be it known that I, JOHN WAHLBERG, a citizen ofthe United States of America, and resident of New York, in the county ofNew York and State of New York (whose postofice address is 930 St.Nicholas avenue, New York, N. Y.), have invented certain new and usefulfmprovements in Micrometers, of which the following is a specification.

This invention relates broadly to measuring instruments and moreparticularly to micrometers for use in making ine measurements in theconstruction of various kinds of machinery or mechanism where exact workis required or in the ascertainment with great exactitude and expeditionof any or all of the various dimensions of any selected object orconformation; and aims in part to provide a type of controlling meansadapted for either slow control or relatively rapid control at theoption ofthe manipulator.

The invention also includes various minor and subordinate features ofgeneral application in measuring gages, all as shown in the accompanyingdrawings, described in the following specification, and particularlyclaimed in the clauses of the appended claim.

1n the accompanying drawings, which are to be taken as a part of thisspecification, and wherein are shown two of the various possibleembodiments of this invention as at present preferred: Figure 1 is aside elevation of one of said embodiments; Fig. 2 is a rear elevation ofsaid embodiment; Fig. 3 is a vertical sectional view, illustrating aview of the parts relatively located in accordance with the elevationshown in Fig. 1, this figure 3 being partly broken away and partly inelevation; Fig. 4c is a top plan view of the parts shown in Fig. 1; Fig.5 is a horizontal sectional view, taken on the line 5--5 of Fig. vl;Fig. 6 is a detailed view, showing on an enlarged scale certain of theparts disclosed in Figs. 3 and 5; Fig. 7 is a view similar to Fig. l,but showing another embodiment of this invention; Fig. 8 is a viewsimilar to Fig. 3, but disclosing a possible interior construction oftheembodiment disclosed in Fig..7.; and `Fig. 91st viewsimilar to Fig.y5 but takeny on the line Similar reference c lKiara.ctezrs to lar partsthroughout the several views of the drawings.

Referring now to the characters of reference on the drawings, and moreparticularly to Figs. 1 to 6 inclusive, 10 represents the main frame ofthe embodiment now being described, which frame is provided with ahousing 1 1 within which moves a reciprocating spindle 12, and whichframe is also provided with an anvil 13 located in line with saidspindle, it being understood that the article to be measured ispreferably placed beneath the lower end of the spindle 12 and in contactwith the upper surface of the anvil 13, and said spindle moved downuntil it comes into contact with the article. The frame 10 is furtherprovided with a transverse aperture 14, preferably circular in outlineand preferably for the accommodation of one of the ingers of theoperator. The interior of the housing 11 communicates with ahorizontally arranged chamber located within the frame and adapted toaccommodate the gear train which includes the gear 15, the shaft 16 uponwhich said gear is lxedly mounted, a portion of the hub 17 as shown, thepinion 18, the gear 19 and the shaft 20, the pinion 18 and the gear 19being both loosely mounted upon said shaft 20 and said pinion and gearbeing ixedly connected each to each. In Figs. 5 and G is illustrated apossible mode of ijxedly mounting gear 15 upon liub 17, and in thisconnection attention is directed to the key-way 17 formed in the hub andthe key 15 carried by the said gear. r1`he spindle 12 carries`thereabove and interiorly of the housing 11 a cylindrical rack 21 withthe rib-teeth of which gear 19 is adapted to mesh, pinion 18 and gear 15in turn interineshing. A coverplate for the chamber just referred to isprovided (Figs. 3 and 4), this cover-plate including a plurality ofvertically arranged apertures and a single horizontally arrangedaperture as disclosed. W hen the cover-plate is properly in place, oneof the vertical apertures admits of the passage therethrough of thescrew-head of shaft 18, the other of said vertical apertures permitsofthe passage therethroughpof the` hub 17, and, the hori-` zontallyarranged aperture L registers, with a similar apertureformed; as showniinlthe main yframe 10:; andthe cover-plate is 'main- ,tained in,positionbyf means of the screw 23,

this Screw. being. provided. at its .Outer arid.;

with a kerf and at its inner end with a reduced pin extension adapted tocooperate as illustrated with the annular groove formed on hub 17 andthereby to maintain said hub against vertical displacement. A knurlednger piece 24 is bored as illustrated and is adapted to be set in placeto take about the hub 17 and rest upon coverplate 22, said finger-piecebeing iixedly mounted upon said hub in any suitable manner, as by meansof the screw 25. The coverplate itself may additionally be maintained inplace by means of the utilization 0f additional screws or the like asindicated at 26 in Figs. 1 and 4. Carried also by spindle V12, aboverack 21, is a worm 27, the threads of which are adapted to coperate withthe appropriatethreads carried interiorly of the upper reduced boreVwithin housing 11. The extreme upper terminus of the spindle l2 Vhasxedly mounted thereon the knurled sleeve 28. As best shown in Fig. l,the lower exterior edge of sleeve 28 carries the usual orany desiredcalibrations, arranged horizontally and circumferentially of said edge,and an exterior side face of housing 11 carries the usual coperant orotherv desired calibrations, arranged in vertical prolongation.

Having described'this embodiment of this invention, the operationVthereof, which `should largely be obvious, is substantially as follows:If any of the ordinary slow-motion measurements are desired to be taken,the spindle 12 is advanced toward the anvil 13 by means of the rotationof sleeve 28, the provision of the cylindrical rack 21 insuring thatsaid rack is always in mesh with gear 19 irrespective of the altitude ofspindle 12 or the rotation and longitudinal travel of the latter; andwhile the associated geartrain is during such travel set into motion, noparticular harm results therefrom since the finger-piece 24 will merelyrotate simultaneously with, and in the present instance at a smallerspeed than, the rotation of sleeve 28. It is often desirable, however,in aid of expedition at least, to advance the spindle more rapidlytoward the object to be measured than is conveniently possible by meansof the normal utilization of sleeve 28, in

'which case, in the present embodiment, it

would merely be necessary to rotate the finger-piece 24 and therebythrough the gear-train aforesaid, the driving gear 15 of which isfixedly connected to said nger piece and the last-driven gear 19 ofwhich is always in meshV with the rack 21 ir'respecL tive of thealtitude of spindle 12. The preferable process is to manipulatefinger-piece 24, thereby to cause the spindle 12 to approach atrelativelyhigh speed to and to within close proximity to the articlesupported on the anvil 13, and nexttomanipulate sleeve 28 to advancesaid spindle against said article and into contact therewith at arelatively slow speed.

Referring now to the embodiment disclosed in Figs. 7 to 9 inclusive, itwill be seen that there are here provided the frame 10, the housing 11,the spindle 12, the anvil 13, the aperture 14, the cylindrical rack 21,the worm 27, the knurled sleeve 28 (which is disclosed as being heremounted upon the worm 27, however, as by means of a screw 28), andcalibrations similar to those mentioned in connection with thedescription of the embodiment of this invention disclosed in Figs. 1 to6 inclusive. The interior of the housing 11 also in the present instancecommunicates with a chamber 29 similar to the chamber which in Fig. 3accommodates the gear-train above described.

The gear-train which is in this embodiment accommodated within chamber29, is, however, dissimilar to the gear-train of Fig. 3,

and includes a gear 30 which meshes with Vthe rack 21, a pinion 31 whichmeshes with the gear 30, a pinion 32 which is fixedly carried by gear30, and a gear 33 which meshes with said pinion 32. Pinion 32 and gear30 are mounted loosely upon a shaft 34. Pinion 31 is fixedly mountedupon the lower end of the shaft 35, and gear 33 carries an elongatedhub-portion which loosely sleeves said shaft 35. The cover-plate 22 inthe present instance is provided with a vertical tubular extension asdisclosed, this extension being adapted Vloosely to sleeve thehub-portion of gear VAn auxiliary finger-piece 38 is in the presentinstance ixedly mounted upon the upper end of shaft 35, as by meansofthe screw 39.

Having described this embodiment of this invention, the operationthereof, which should largely be obvious, is substantially as follows.It will be seen, when the sleeve 28 is manipulated at, say, 3/ speed,that the spindle 12 will travel at y speed. It will also be seen, whenthe Hilger-piece 24 is manipulated at. said fg. speed, that, since said"finger-piece. 24, being .clamped upon the hub portion of gear-33,establishes said gear 33 as the driving element of the gear-train, theYspindle 12 will be moved at a speed greater than Y/ speed. It will alsobe seen speed, and vice versa,W whereby by alternately making one ofthem the manipulated part the operators lingers may be less liable tobecome cramped and weary.

Inasmuch as many changes could be made in the above construction, andmany apparf ently widely dierent embodiments of my invention could bemade without departing from the scope thereof, it is intended that allmatter contained in the above description or shown in the accompanyingdrawings shall be interpreted as illustrative and not in a limitingsense. It is also to be understood that the language used in thefollowing claim is intended to cover all the generic and specificfeatures of the invention herein described and all statements of thescope of the invention which, as a matter of language, might be said tofall therebetween.

Having described my invention, what I claim as new and desire to secureby Letters Patent, is:

A measuring instrument comprising a threaded gaging spindle, a supportwith which the spindle has threaded connection, a table or support forthe article to be measured, and manually operated means including gearelements coperating with the spindle to move it toward and from thetable and to hold it in any adjusted position, the parts being shaped sothat the device may be held by the lingers of one hand,

leaving the thumb and indeX linger of that hand free and in position tooperate said means.

In witness whereof I have hereunto signed my name in the presence of twowitnesses.

JOI-IN WAHLBERG. In the presence of- AUGUsTUs M. HENRY, ALDA L. MILLER.

Copies of this patent may be obtained for ve cents each, by addressingthe Commissioner of Patents, Washington, D. C.

